"Yeah, OK" (4)

I believe the answer is:

sure

This clue is a double definition.

'yeah' is the first definition.
(thesaurus)

'ok' is the second definition.
(both can mean 'yes')

(Other definitions for sure that I've seen before include "stable" , "Completely confident that one is right" , "Confident sort of ruse" , "Certain, confident" , "Completely certain" .)

I've seen this clue in the USA Today.

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